At the first attempt, Blood in the Water critted and B/B Runeforged died too soon. Second attempt, my P/S Robo-Chick died before Bruce did. My Runeforged then killed Bruce with Call Lightning and then proceeded to kill Maws Jr. as described,
Worked great, first try. Used P/S Iron Starlette (speed 273). Other breeds might be a problem because speed is 244, lower than Chums (260), so they will take extra damage. Was able to kill Chum and get Bruce down low enough that Robo-Chick didn't need Supercharge to kill Bruce first turn in... Thanks!